Telephone-call-bell system



(No Model.)

4 R H S T h H R.

TELEPHONE GALL BELL sYsTEM.

Patented Feb. 9,1886;

I PM (No Model) 4 Sheets-Sheet 2.

F. E. FISHER.

TELEPHONE CALL BELL SYSTEM.

No. 336,002. Patented Feb. 9, 1886K N. PETERSv Phamuilw hur, winhinglon, D c.

(No Model.) 4 SheetsSheeL a.

F. E. FISHER.

. TELEPHONE GALL BELL SYSTEM.

No. 336,002. Patented Feb; 9, 1886 [nu away" (No Model.)-

F. E. FISHER.

TELEPHONE CALL BELL SYSTEM.

Patented Feb. 9, 1886..

\L' r .7 Li k g i h J n N g Q J 4 Sheets-Sheet 4.

UNITED FRANK E. FISHER, OF DETROIT, MICHIGAN.

TELEPHONE-'CALL-BELL SYSTEM.

SPECIFICATION forming part of Letters Patent No. 336,002, dated February 9, 1886.

Application filed August 14, 1885. Serial N0.174,411. (No model.)

To all whom it may concern.-

Be it known that I, FRANK E. Frsnna, of Detroit, in the county of Wayne and State of Michigan, have invented a new and useful Improvement in Telephone-Gall-Bell Systems, of which the following is a specification.

My invention consists in an improvement in call-bell systems for telephones, whereby several telephones may be placed in one circuit, and the call-bell of any one of them may be rung from the exchange without ringing the bell of any of the others.

The principle involved in my improved sys tem is, that the bell-circuit is normally open, and is closed by an electric motor operated by a current in the line; and the invention consists in the combination and arrangement of devices which will be hereinafter fully described, and then set forth in the claims.

Figure l is an elevation of the connections of three telephone-station apparatus in circuit and the exehangeconnections therewith. Fig. 2 is an elevation of the indicator in the eX- change. Fig. 3 is an elevation of the bell-circuit. Fig. 4c is a view of the telephone-connections, showing the bell-circuit broken by lifting off the receiving-telephone. an elevation of one of the motors and the circuit-closing mechanism. Fig. 6 is a rear elevation of the motor. Fig. 7 is a side elevation of Fig. 5. Fig. Sis a vertical section through the motor. Fig. 9 is a section through the center of the circuit-closing mechanism, and Fig. 10 is an enlarged side view of the same.

T represents a telephone-station apparatus, only the call-bell being shown; and in Fig. 1 three such telephone apparatus are shown on a single circuit or line, L.

It represents a receiving-telephone, and A represents an annunciator commonly used in telephone-exchanges.

B represents a battery.

N represents a magneto-electric machine in the exchange, and H the magneto in a telephone-station apparatus.

G represents the ground.

P represents the operators calling-key; P a telephone-line switch to connect the line with the operators telephone or the magneto or another line, and l? a key to connect the Fig.5is

line with the battery 13 and cut out the annunciator and operators line.

K represents the key commonly used in a telephone-station apparatus to throw the magneto H into circuit.

M represents an electric motor, which may be of any known type. As illustrated, it con-i sists of two semicircular magnets within which rotates an armature, and the construction of this class of machines is so well known that I do not deem it necessary to describe its construction in detail. One of these motors is placed in the exchange, where it can be observed by the operator, and on its front side carries a plate, a, in which the armature-shaft is journaled, and on said shaft is fastened a pinion, l), which meshes into a gear-Wheel, c, hung on a shaft which also carries a pinion,

d, which meshes into a second gear-wheel, e.

The object of this train of wheels is to reduce the rapid motion of the armature to a slow motion, and to that end the number of wheels and pinions may be increased or decreased at will.

5 represents a slotted post on one side of wheel 6, in which is pivoted one end of a lever, f, the other end of which projects beyond the circumference of wheel 6, and passes through a slotted post, h, in said wheel,which prevents lateral motion of the free end of said lever f.

t represents a light spring secured to wheel 6, and the end of said spring passes through a slot, j, in lever f, and holds said lever lightly against wheel 6. On the face of wheel 6 on the motor in the exchange is a series of numbers, similar to the numbers on a clock-dial, as shown in Fig. 2. Each of the motors carries a similar train of wheel-work, and one motor is placed at each telephonestation apparatus in the circuit. The line L runs through each motor, as shown in Fig. 1, and the result is, that when acurrent passes through the line it passes also into the train of wheel-work on each motor and through the lever f.

D represents a piece of hard rubber or other suitable insulating material secured to the frame of the motor, and partially surrounding the periphery of Wheel e. To this insulator D is attached one end of a curved spring, E, the other end of which is V-shaped,

(shown at '0, Fig. 3,) pointing against the path of rotation of the end of lever f, so that when said lever strikes the end of said spring it raises the end of the spring and passes thereunder; but owing to the shape of the end of said spring it cannot return, but will be held by the spring, as shown in Fig. 3.

s, Fig. 10, represents an ordinary clockspring contained within or behind wheel 6, so arranged that when wheel 6 is rotated by'the motor the spring 8 is compressed, and when the motor ceases to operate, the spring .9 returns the wheel-work and armature-shaft to their original position.

F represents a spring secured at one end to the insulator D over the line of travel of the free end of lever f, and at such height from wheel 6 that lever f, when moved'by the motor, will pass under said spring. The free end of spring F is inclined toward the face of wheel e, so that the end thereof lies in a plane between the face of wheel 6 and lever f, so that when said lever f is rotated by the motor it passes under spring F, raising the free end thereof, and when lever f is returned to its original position by spring .9 it is raised by and passes over spring F, thus clearing spring E. Each subscribers telephone-branch is grounded, as usual, and in each branch is the usual switch, S, which is operated by the weight of the receiving-telephone R in the usual manner to close the bell-circuit and break the telephone-circuit when the receiver is hung thereon, and vice versa.

0 represents the bell-circuit of the telephone-station apparatus, and instead of being connected with the line, as usual, it is connected with the spring E, which is insulated, as above explained, and therefore cannot receive any current passed through the line, except when the lever f isin contact with spring E, when a current passing through the line passes through the motor into lever f, and thence into the spring E and bell-circuit C. The line, on entering the exchange, passes through the motor M in the exchange, runs to a key, P, whence it runs through an annunciator, A, and to a calling-key, P By depressing the key P the line is cut out from the annunciator and connected with a circuit in which is a battery, B. By operating the lineswitch 1? the line is thrown into connect-ion with the operators telephone R, and in this last circuit is a calling-key, P, which, when depressed, cuts out the operators telephone and connects the line with the circuit of a magneto-electric machine, N. Thus when none of the telephones are in use the circuit in the exchange is through the line L, key 1?, annunciator A, and line-switch P" to ground.

The arrangement for' throwing in and out theoperators telephone and the magneto N is not new, and is in common use, sowit needs no further explanation.

The operation of my invention is as follows:

' Suppose that all the telephones on a circuit are not in use, and the operator wishes to call telephone-station numbered 1, in Fig. 1. By depressing key P a current from the battery Bis sent through the line, and through all the motors in that line, passing to ground at the end of the line. This rotates the armature-shafts of all the motors, and causes the trains of wheel-work on the motors to revolve substantially synchronously. As soon as lemovement of the lever is checked by the V-- shaped end of spring E, and the lever and spring are held in contact, as shown in Fig. at. This connects the call-bell circuit C of the telephone-station 1 with the line-circuit L, as above explained, and leaves the bell-circuit in every other telephone-station apparatus open. The operator now depresses the key and switch P P, and thus sends the current from the magneto N through the line, and this, being an alternating current, has no effect upon the motors, which are constructed to run with a continuous current, but rings the bell at the telephone-station No. 1. When the subscriber at such station No. 1 lifts his receiver off from the switch S, he breaks the bell-circuit, closes the circuit through his telephone, and is connected and talks in the usual manner. When the signal for disconnection is given, the operator again sends the battery-current through the line, but this time rotates lever f (telephone-station N o. 1) a little farther, untilits end clears the free end of spring F, and then stops the battery-current, when, on the return of the lever f, through the action of spring 8, the lever rides over spring F and thus clears the hooked end .of spring E, thus restoring all the parts to their original position.

To call telephone-station N o. 3, the operator sends the battery-current through the line until the lever f on the motor in the exchange passes the number 3, when, as the springs E are set at'different points in the travel of the levers fin each motor, the levers f in the motors arranged at the telephone-stations 1 and 2 will have passed beyond the free ends of the springs F in said motors, and will ride over the springs E and return to their original positions as soon as the current ceases, while the lever f on the motor of the telephone-station No. 3 will be in position to be caught on its return and held by the hooked end of spring E in said motor, thus closing the bell-circuit of the telephone-station No. 3.

It is evident that by the method herein described a number of telephone-station appa- In that ratus may be connected on a single circuit,

and each one called independently, and that the necessity of absolute synchronism in the movement of the motors is done away with.

It is evident that any subscriber can ring the exchange in the usual manner without ringing any of the other subscribers on the same circuit,for an inspection of the telephoneapparatus connection in Fig. 4 shows that the induction-coil I, magneto H, and switch Kare connected with the binding-posts p and lineL in precisely the ordinary manner, the only change being in the connection of the bellcircuit with the line.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. In a telephonic call apparatus, the combination, with the main line and local signaling-circuit, of an electric motor, an indicationdial adapted to be moved by said motor, and devices carried by said dial for closing the signaling-circuit, substantially as herein set forth.

2. In a telephonic call apparatus, the com bination, with two or more telephonic-station apparatus having each a signalingcircuit terminating in an insulated contact-piece, of an electric motor located in the mainline circuit, the rotary armature of .said motor, and the movable circuit-closing device set in action by said armature and co-operating with the insulated contact-piece of the signaling-circuit, substantially as herein set forth.

3. In combination with a telephonic callbell circuit normally disconnected with the main line,an electromotor located in said main line and a movable contact-piece connected with the armature of said motor in electrical connection with said main line, and adapted to come in contact, when moved by said motor, with said call-bel1 circuit, substantially as described.

4. In a telephone system, the combination of the following elements, viz: a single circuit, a continuous-current and an alternatingcurrent generator and means for connecting either with said circuit, two or more telephones located in said circuit, each having its bell-circuit disconnected from the main circuit and terminating in a spring-catch, a motor adapted to work with a continuous current located in and forming a part of the circuit at each telephone, a train of wheel-work connected with the armature of each motor, a pivoted lever attached to the last wheel on each motor, each adapted to come in contact with the terminal spring-catch of the bellcircuit of the adjacent telephone at a different point in the rotation of the wheel, a clockspring connected with the wheel-Wort: on each motor and constantly tending to restore said wheel-work to its original position, and an inclined spring adapted to disengage said pivoted lever from said spring-catch, substantially as shown and described.

5. In combination with the telephone-circuit L and telephone T, having the open bell-circuit G,the electric motor M, havi ng connected therewith the pinions b d and gear-wheels 0 e, clockspring 8, secured to wheel a, the leverf, pivoted to wheel 6 at g, the spring 6, secured to wheele and engaging with slotjinleverf, the insulator D, secured to the motor, the spring E, secured to the insulatorD, in electrical con nection with the bell-circuit G, and having its free end \/-shaped, and the inclined spring F, also secured to the insulator D, substantially as shown and described.

FRANK E. FISHER.

Witnesses:

GEO. A. MoKlntoorr, G. J. CARROLL. 

